Electron yield per ion charge-state correction for an ion collector with unsuppressed secondary electron emission

The electron yield per ion charge-state gamma/q was measured for emission o f electrons from clean polycrystalline gold induced due to impact of Taq+ ( 11 less than or equal to q less than or equal to 41) ions with kinetic ener gy per charge E-i/q from 15 keV/q to 150 keV/q. The dependence of gamma on angle of incidence was analyzed with use of relation gamma(theta) = gamma(0 ) cos(-f) theta. The fitting of experimental data gives a range of gamma(0) /q from 1 to 1.75 for Ta13+ and from 1.5 to 1.73 for Ta39+. The dependence of gamma(0)/q on q and E-i is discussed with respect to measurement of ion currents emitted from laser-produced plasmas with an ion collector with uns uppressed secondary electron emission.